Is this because it only uses one 5AR4 or GZ34 rectifier? The WA2 and WA5LE both use two rectification tubes.
I am worried that the WA22 may not drive HD800s properly if its a little shy on power.
In my last email to Jack in reference to how would the WA22 compare to my maxxed WA2 in terms of sound and power. His response-
"Compared to WA2, the 22 has higher power and bigger sound.
You can use either input with any output. However, the amp operates in balanced mode on a balanced input only. I would highly recommend that you use a balanced source to take advantage of the design."
I use my WA2 with Denons, Grados, Beyers, Senns, Ultrasones and it drives them all with authority.
I really can't see the WA22 being shy on power. Quite the opposite.